Burglar alarm

Details Burglar alarm Burglar alarm

G - Physics

08

B

340/128

G08B 13/22 (2006.01) G08B 13/08 (2006.01)

Patent

CA 1050629

ABSTRACT OF THE DISCLOSURE A burglar alarm that has a series of switches located close to each other and that are responsive to the application of a magnetic field. One of the switches terminates current flow to a sentinel current device while the others initiate current flow to the sentinel current device. The sentinal current device operates to supply voltage for an alarm circuit when it conducts only. Thus, in order to render the device ineffective, one must know how to apply a magnetic field to the terminating switch only without activating any of the switches that initiate current flow. The switches are all located close together so that special knowledge is required to cut off supply voltage to the alarm circuit.

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